Re: Cadillac XLR engine removal due to shop error.....
Valves jammed down and pistons coming up = bent valve stems and maybe cracked piston(s).
I'd want to see the damage before they fix it. You do not want trouble down the road and they say it's a new problem with no warranty.
A mechanic(?) forgot to put the oil back in a Viper where my wife worked once, the guy never got a block before the engine seized and that meant one newly unemployed mechanic looking for a job.